It is a thin, pliable silicone for maximum comfort. Medela Contact Nipple Shields feature an open section for greater skin-to-skin contact between you and your little one. Be sure to seek the assistance of a Lactation Consultant if you continue to have a latching issue. The Medela Contact Nipple Shield is meant to be used as a temporary fix, and a Lactation Consultant can help with all your breastfeeding issues.